Hello Parthiv,
In SL3 WindowState is located in Telerik.Windows.Controls namespace, but in SL4 we use WindowState enum located in System.Windows namespace. The reason for this is that in SL3 there is no WindowState in the System.Windows namespace and we use our own enum. Unfortunately, the differences between SL3 and SL4 controls are not documented at this stage. We are sorry for any inconvenience caused.
Meanwhile, you could refer to our release notes for the changes in each new version release of Telerik Controls according to the previous ones.
Regards,
George
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the
Telerik Public Issue Tracking system and vote to affect the priority of the items